bug#24401: python-shell-completion-native-try returns incorrect results with python 3.5.2

[Noam Postavsky]

On Fri, Sep 9, 2016 at 7:07 PM, Clément Pit--Claudel
<clement.pitclaudel@live.com> wrote:
> Hi all,
>
> Calling ‘run-python’ in ‘emacs -Q’ with ‘python-shell-interpreter’ set to 
> "python3", I get the following warning:
>
>     Warning (python): Your ‘python-shell-interpreter’ doesn’t seem to support
>     readline, yet ‘python-shell-completion-native’ was t and "python3" is not
>     part of the ‘python-shell-completion-native-disabled-interpreters’ list.
>     Native completions have been disabled locally.
>
> This warning is specific to Python 3 (it doesn't happen with Python 2.7). 
> Additionally, the warning is spurious; native completion works fine.  This 
> whole feature is new in Emacs 25.

I'm not familiar enough with Python tooling to say much about this,
but it seems similar (maybe identical) to #22897?